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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79a98935c9f5405869be8976529cc211fd548c30eedb02dd262c9c5482043ad' 
  AND token = '3acxQ4+1ZxKia8+8lokcJ39L+hyWL4H3ZmwXFhQB3O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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