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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdae3e8d7ada3e396fe7c5b5058ba0f35b7b83dcf4c2ac761b47a89f996e5c4d' 
  AND token = 'Zny6M0Z85ZFaSEftrrY+WfbBts+XrtFVB4pVJmIIGgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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