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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e489793acd15ebe65c403ea0d365fe5f0c23e340f476aa896fcf5754c6485637' 
  AND token = 'b96iS7hwY1Q97Axrpp6eu77n6ovHIUfRdiC4FQunI2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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