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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe1876160046ab21513d26436bc6bda77cc7c520e0e76f8bb7fea2bfd61fe4d' 
  AND token = 'f81FHxcLorsM4keuvoTe3jB0tv68KpKvOIPq5Mh92F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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