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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8aed9ddbb8df0ddea47cfcb6d0436053a99b41d4e5a91738f8e99dd284cdd2' 
  AND token = 'YjkCe9ZPrjl8tuu9d5D3y4GBWI5PaQzUTIlyRErTrd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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