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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f845e13ae49461f190c7947c30bbbb7caef41e2c0d75991d8a7ba16d1c68cbe3' 
  AND token = '6vb4YcxWTAz3X9MLLJ4p5lMgP1eVFiGYUWga1z44OUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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