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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c5482226efe44ac6ef473fec9ad606a6b61c0c208e310d4c2a19bab4754b4a' 
  AND token = 'lp/B1x2zvVbJ42d/7/4ZiDj54TWkTsqtDuvFyaABBUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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