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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3d210f355a5da4c73a60837f68425ed137367d7fbb90fa2400e1beaa3d0e72' 
  AND token = '+TH8hkVbDKO6qmx7hK46FFssoVR99ut/Gx3LJiKDUD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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