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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd832237ce32f60833c220a85dde6376f7998202d7175d0893272440078d1211a' 
  AND token = 'xNsXn3luvTu1SZTCe1haCmbwO8W8/eAjSVsP7MFiXLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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