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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c32c6c99bd9a8bb1f5421554ae5907edd9272ef257bdc5ec3a3fdee2e7eb339' 
  AND token = 'lrZR4b+AvdIAtyMSlOpSerF1HH6N9HfWkPPAcUJDYjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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