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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ba89e4d3ad283e9b0949e315c5173784a2f16423f02c3d954deca3f4f10ae7' 
  AND token = 'hdDWB+tIqRYaeLanqMQg6wTEpVEMBqj0ytempzilzGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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