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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf104046789931a6f92ca45c6b94453a5738e0fd8eb91e2360a0de3bfc28daae' 
  AND token = 'w7cfcuZQIgkatodnul3kxFi7Z6+PgZWoYHxG8Oml08s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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