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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb553ce86d0f20ddb72d533d2b2c5243745d6ab2823d728efa34710703036bb' 
  AND token = 'ckWQAIipI+H4sMNRz4k0gmZCgEmaWPazg940TFWhpXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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