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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f41a2347d0c53be8c8d9c3b3fa8a250dfa17523230aecd9d77f7956bd9a9d0' 
  AND token = 'FOZ565buA8VZLjG8J4BJaJ3/OeyX/9bc9Pcv4n59rzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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