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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e057a4da0557005ff154880b10437c7c0ed06ebe0aed7daa6f010e299b35772e' 
  AND token = 'h7HLrt4Tb45MmGO0pwgBdQz8Etshmpz2e/7yJfPV8xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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