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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f54a386046a783455bbc636284af08ee6f9822b5a2d88fbc6e354b6139db6d6' 
  AND token = 'SgCsd/E2twvBWr4SMM42GNvuPbnCj767nBL6k+b6RWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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