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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e82c00236b5ff84184a29fdfcec458e3ba62efffe2e7bc76d8ce9c0b5a2d736' 
  AND token = 'pSE7pjy1F15D/RoWdkzqsnqcJBiYwU9owz0PctOkD3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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