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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51875c3e4da784a70f9ef56d484d8cfad838c89bd77be9d5fede5188617f0c1' 
  AND token = 'URLOmoatBo/xnbvXdzOYgF6pleoIodcLe13RJo34yaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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