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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36644390b6fd9f4706ca6d41ce48d333ec900f6435943666e53226106945e270' 
  AND token = 'Kvj25TaT+FSziNVN/llAH+dr/UenuuhC2n35WbhO8Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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