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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a91d0347f67ab34417cc6fda13bd33b081eb86ab7458c8b6220f8f05d490a52' 
  AND token = 'E9IizaqmJysoGAsR5QkXCcMSWG29OIKIRpSDCOjwNXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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