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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24a16c09d1c29ae630f7d9a63f1e133110af0d194dee44cc9a68c0fd587aa13' 
  AND token = 'Wl4BP7ZdkbU6deX4Kd86sl+2noo38VFcjSPkTkPExkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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