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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af9537333ad73e3d2cebc182ce3c210c0532cc4c2bc7e1b8e2b7b231dcd6705' 
  AND token = 'tfcediJuoHxCxQPNFU/u1mVRRjZz9ri+0ISQsg53Wcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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