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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2385549ff1099bb88e0cc3b3ea09831a6118f7814f220e6dceb21ae881454cd4' 
  AND token = '30PHrp9Ds1XdmE+hqcZgT917R23KBCPNCG3b2bZEB6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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