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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e942adf18bbb8d7c7344e860ae04edad177ee0b10ec0c0bed78ef1ec9752156e' 
  AND token = '4dfp2zumThTKm6G2+aZZAa1xF/XP+eNBO9m7tUIg0sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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