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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2885a50161e03db57a5a05f8d6a8d6d9681918b565a455486048dcecfe5a0879' 
  AND token = 'N51+4yPedrlUdJiVGr51c1sR/0gNrYgrsm8XtJWLCok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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