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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6d3a48d36039b9ccdacaf5cef3498389ae7d1d31b8743e901bc2b9462f0f93' 
  AND token = 'VheVoU0Fz9JdjB7JKpXj/j8QFmICKrV2pdzp0r66cTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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