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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452ad4c6a468a24bc74a7bef38050398b015d15832ee9eec28c99565e4e5ee15' 
  AND token = 'JzWADo3nJtHIT6SSKjFF/QYeLpO0D6+D26ss+qSK1pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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