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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd888baa93a09d9d06d3216af5d73abb45c806d61bb661270a54be4e0fe910be7' 
  AND token = 'Mh3dE2hdEZpmAKuwWG6wlTNrTnldP4s0wGGzUPfbnm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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