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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d49aa17615d339f422ca693429a8f19a3e26c45a63f4b19a08ba29b1079488' 
  AND token = '3IF/Su2EEgWXRUr5I61c6Wqf4rmMHhJXjQjurRvGfaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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