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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ff3cfbc5b899af80ba9d2d79e996b3e7f70a4cb7d5746894f7412c01f243a8' 
  AND token = 'pEsFSEdMcSU5idn7Tbwikm42Ad2SagtH/teqt3+kDrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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