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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23750c0f71140ba7ce7bdcfbf28fd3896c2d1ef836cb4637c2954f9bd8d0fb22' 
  AND token = 'sPCT1yFoljKSIBky2Syou5iEs2xe8G/OabvY7DnO7j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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