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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d842d2bb640235ef5a485a1ca0716f983e6d959baaf7fd691fc3ce5d747c05' 
  AND token = 'O1o2B3kb82ox1g1sqLMLRFyphrMCaqh/4AzjDPHNOiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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