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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac53bed325d08c4b193581dcf6ce096423b1d30adff4664d4bcde4390c176ac' 
  AND token = 'ehQLAX+RW33YhpDD/lm/0pYu1OJ6lEpwSQbIzaOqeVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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