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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ec3810b45b6b5ba3c8434266539325a2dd82c4c7e5764adf02c5f8cb39459c' 
  AND token = 'QdS6jQWLLhORNYni/3wcvegXnzX+Ncsk0v2TBAisJ40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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