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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67afa66f097ac1f043fbc9f52ba65e06cb6a0362a256143764ae484e49c0b926' 
  AND token = 'fz/ElNOOsvfUiQ57s9jx9D2/c3WQ+m1EK5S6MM284g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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