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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3134286eb245c611d482f697ac5975b85156d5c1ca0a4a0691d63fd9f0daf2a6' 
  AND token = 'qbBE5abhpjXQ2/QRpFoXVfOR2mW4desA3jh9UvNtyDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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