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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10869e973073b8601815a376cd1012779cc11d427f6172809f5a67b8a5d1431e' 
  AND token = 'wAVZp7hN220wflC4NDxqlhM6upKmwtn47NsP/y1jy4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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