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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba275d3a1f8f427e97a628eed1e28c61d4025500ecced6d18976f787b90e22fc' 
  AND token = 'ls3RT+79bWVSZW0Glri5HGPBP5alvdpUywRhbQ3Xd4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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