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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996f227128ca572d3db16111a8bfef3a9745bb82fbd73bcc14ad889e4aab21a4' 
  AND token = 'i+G4AgfT6sfy8veFdcsc9LuPz7XoyP6s4HW6pepiB5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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