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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57631ec613f8c776341d5733d664d9df8d9f34634e930ad7e5c51073b46c451' 
  AND token = '66QcbELMYG648gMhTyngPjwG6xInRgNzGGpFi8Jg/Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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