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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec81472a8307470aece4f7f9962162550e66bb98250bc568089b17457999d1c' 
  AND token = 'wY61Clk0gilA3rR5L7yYpl9v1NyFVYNOWDacaAtXM40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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