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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e0df9c129d5b9b85587d7361e705edcecc7103ae018664ef26c5bb6038a345' 
  AND token = 'wI+PAzHlWcnzgUD/BEbXjQn42Wjqke6NqQsdUPDXx68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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