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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b69266818d2398255228d2c3b9e607ffe0f3e2037d07cf80ddc3388580b7ff' 
  AND token = 'e8b6sy7R7uZabPVXYNyr6rr9KS2lKnznDT4RxGDRkHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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