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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554ab3cec36572498f2328391b533c9b58788b149bd2d8b8f6e4eff88895f345' 
  AND token = 'FXiuY1dPjEFii7TbX/D44JTAI/qOXIT1c8lYX513SlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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