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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193ccef191571befb05beab0390db508a52775f9a1df3d9f8bf5ff9ca9afa2d6' 
  AND token = 'dlaUawL6XqIR4r97YG8jb3lNRc4hn67dMrXiK3WhGGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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