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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb72e62d5cba4b784c261b01eedcfc18d1f12ae4194a201380e8140ca46e269' 
  AND token = 'QVQdyDjqMpNfBYJwZ7IFRP4CeI/HTbecb1AKWr7Dfwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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