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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344b573a90cd6bff6fb41ebbddb9de4e06336ee1c3ca41e9a7163e1dd3bae104' 
  AND token = '9egKiPX7dAk36mwT/SSAQOHYnG3r6Dwa4xeUrSvDTJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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