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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c811ca74055384ae32e12f1a1978b5adf09b5cf6ac1a9ff5092bec12527ccc74' 
  AND token = 'y5jv4cK2t9+RZT6nd/j0mgNcLVm986UQ0vbANbyi2xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}