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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc63ba83670d8dd3d3027fece274edc891ba9dd351ea8f5c920e6c3ec567ccc' 
  AND token = '54PutuxF3BT4V3jt9N2WiWXJWxaVO0cWhGAOQPYn9zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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