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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dff9063e236d977d88ff72ba46086a7928daf2c8bac6c9d565878161d047788' 
  AND token = '+Vl13DkgazdvWw4Q95qmEF5uGR7A4hZeHE0r9iob5a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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