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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdfdb1530eeaf2cd6610056751e161847485b7e6c576c8ca380ec18d0a9f69f' 
  AND token = 'pwZ9CFbni4Zo/IzJow9bp4h3mfOjGFWe23ECQLQJf80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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