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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb95fe4dd81804ebf2afaa26e8dfddf7937bbf93b0878f849f670e28ef56d825' 
  AND token = 'U+AQ2nEComPU1Xod9nj3GhLh3zdPn6wTlWAzsRyFg1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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