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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c5f2d207a4e0175e20c04796f9ee192caf3b89c3b38c73afe853bbd943a9f9' 
  AND token = 'hQrq7XAvGFSkMfpLNX5B9FtbUkpSHlSw2TXRAPZo7O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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