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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2bc2939186f2ea5dd8f70bcebe2c10b060f1d2ec7060249086b6631b4a3d7da' 
  AND token = '4VMsv7zjtQ9s70ylwge/xwn7gQSGedEnRTOgCLxIkco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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