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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330b084e008f0263cbbfb54e89a5752f95fe8bdb98c9f366bcc84045f1e303c8' 
  AND token = 'NT5LxSz/CGawZyJA3l6h8NNO0r1MYNGoyIUvclEE6D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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