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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787ac2039b1e72674d8abad5cdfa24135bbaff5ca6aa5eca075cf335f42459a1' 
  AND token = 'B3D3gFuh0MHxHV+wc9S3wvaUudYvDdl7SkrtLTp1c0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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