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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b3a890d4d2c357f37deae4cdbfaf9806c7820225e5563fe6e18de8b7beaebc' 
  AND token = 'wp5TVA1VK+LEDkHVQ9mHDvvInKOeUWtYMO/+LJ2QMdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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