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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e1a4fac81937497b62c2297d4a6e5f0f48413d010cda459580de2cc5b2b0e6' 
  AND token = 'NHTBlJPeKA+iE008NttdiAZFpts0YUbMaKrBie9mPkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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